Method for performing physical uplink control channel transmission and user equipment using the same

ABSTRACT

The present invention provides a method for performing physical uplink control channel transmission of a user equipment in a wireless communication system. The method may include the steps of receiving system information from a base station, wherein the system information includes information on one PUCCH resource set among a plurality of PUCCH resource sets, and performing PUCCH transmission through one PUCCH resource included in the one PUCCH resource set, wherein each of the plurality of PUCCH resource sets is related to one starting symbol, one number of symbols, and one PUCCH format.

CROSS-REFERENCE TO RELATED APPLICATIONS

Pursuant to 35 U.S.C. § 119(e), this application is a continuation ofInternational Application PCT/KR2019/000538, with an internationalfiling date of Jan. 14, 2019, which claims the benefit of U.S.Provisional Patent Applications Nos. 62/616,460, filed on Jan. 12, 2018and 62/620,406, filed on Jan. 22, 2018, the contents of which are herebyincorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to wireless communication and, mostparticularly, to a method for performing physical uplink control channel(PUCCH) transmission and a user equipment using the same.

Related Art

As more and more communication devices require more communicationcapacity, there is a need for improved mobile broadband communicationover existing radio access technology. Also, massive machine typecommunications (MTC), which provides various services by connecting manydevices and objects, is one of the major issues to be considered in thenext generation communication. In addition, communication system designconsidering reliability/latency sensitive service/UE is being discussed.The introduction of next generation radio access technology consideringenhanced mobile broadband communication (eMBB), massive MTC (mMTC),ultrareliable and low latency communication (URLLC) is discussed. Thisnew technology may be called new radio access technology (new RAT or NR)in the present invention for convenience.

Flexibility is considered as an important design philosophy forsupporting various services in the NR system. Characteristically, whennaming a scheduling unit as a slot, a structure in which any slot may bedynamically changed to a physical downlink shared channel (PDSCH)transmission slot (hereinafter, DL slot) or a physical uplink sharedchannel (PUSCH) transmission slot (hereinafter, UL slot) will besupported. Here, PDSCH is a physical channel for transmitting DL dataand PUSCH is a physical channel for transmitting UL data. Hereinafter,the structure may be referred to as a dynamic DL/UL configuration. Whenthe dynamic DL/UL configuration is supported in the NR system, aphysical channel PUCCH transmitting hybrid automatic repeatrequest-acknowledgement (HARQ-ACK) information for the PDSCH scheduledin the DL slot and/or UL control information such as channel stateinformation (CSI) can be transmitted in an area where UL transmission ispossible.

The base station may indicate a PUCCH transmission to the UE through theDCI, and, at this point, a slot to which the PUCCH is to be transmitted,a starting symbol corresponds to a time point where the transmissionstarts within the corresponding slot, and a transmission duration timeindicating through how many symbols the transmission is to be carriedout should be notified.

At this point, the adoption of a new method for performing PUCCHtransmission resource selection and PUCCH transmission in an NR system,which considers flexibility and adopts a new structure, is needed.

SUMMARY OF THE INVENTION Technical Objects

In order to resolve the technical problems of the present invention, atechnical object of the present invention is to provide a method forperforming physical uplink control channel (PUCCH) transmission and auser equipment using the same.

Technical Solutions

In one aspect, provided is a method for performing a physical uplinkcontrol channel (PUCCH) transmission of a terminal in a wirelesscommunication system. The method includes receiving system informationfrom a base station and performing the PUCCH transmission based on aPUCCH resource in the PUCCH resource set. The system informationincludes information for a PUCCH resource set of a plurality of PUCCHresource sets. Each of the plurality of PUCCH resource sets is relatedto a starting symbol, a number of symbols and a PUCCh format.

The plurality of PUCCH resource sets may be pre-defined.

A number of the pre-defined plurality of PUCCH resource sets may be 16.

The pre-defined plurality of PUCCH resource sets may be respectivelyrelated to PUCCH format 0 or PUCCH format 1.

Each of the plurality of PUCCH resource sets may be related to the PUCCHformat and a combination of the starting symbol and the number ofsymbols.

The system information may be Remaining System Information (RMSI).

The one PUCCH resource may be selected based on Downlink ControlInformation (DCI).

The UE may not be configured a dedicated PUCCH resource.

The UE may perform the PUCCH transmission using the one PUCCH resourceset until the UE is configured with the dedicated PUCCH resource.

In another aspect, provided is a user equipment (UE). The UE includes atransceiver transmitting and receiving radio signals and a processorbeing operatively connected to the transceiver. The processor isconfigured to receive system information from a base station and performPUCCH transmission through one PUCCh resource included in the one PUCCHresource set. The system information includes information on one PUCCHresource set among a plurality of PUCCH resource sets. Each of theplurality of PUCCH resource sets is related to one starting symbol, onenumber of symbols, and one PUCCH format.

The plurality of PUCCH resource sets may be pre-defined.

A number of the pre-defined plurality of PUCCH resource sets may be 16.

The pre-defined plurality of PUCCH resource sets may be respectivelyrelated to PUCCH format 0 or PUCCH format 1.

A number of symbols of the pre-defined plurality of PUCCH resource setsmay include 2, 10, and 14.

In another aspect, provided is a method for receiving a physical uplinkcontrol channel (PUCCH) of a base station in a wireless communicationsystem. The method includes transmitting system information to a userequipment (UE) and receiving a PUCCH from the UE. The system informationincludes information for one PUCCH resource set among a plurality ofPUCCH resource sets. The PUCCH is transmitted based on the one PUCCHresource included in the one PUCCH resource set.

Effects of the Invention

According to the present invention, PUCCH transmission resourceselection and its respective PUCCH transmission may be more efficientlyachieved in the NR system, which considers flexibility and adopts a newstructure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a wireless communication system to which the presentinvention may be applied.

FIG. 2 is a diagram showing a wireless protocol architecture for a userplane.

FIG. 3 is a diagram showing a wireless protocol architecture for acontrol plane.

FIG. 4 illustrates a system structure of a next generation radio accessnetwork (NG-RAN) to which NR is applied.

FIG. 5 illustrates a functional division between an NG-RAN and a 5GC.

FIG. 6 illustrates an example of a frame structure that may be appliedin NR.

FIG. 7 illustrates CORESET.

FIG. 8 is a diagram illustrating a difference between a related artcontrol region and the CORESET in NR.

FIG. 9 illustrates an example of a frame structure for new radio accesstechnology.

FIG. 10 is an abstract schematic diagram illustrating hybrid beamformingfrom the viewpoint of TXRUs and physical antennas.

FIG. 11 illustrates the beam sweeping operation for a synchronizationsignal and system information in a downlink (DL) transmission procedure.

FIG. 12 is an example for describing a PRB resource allocation method ofthe above-described Method 1.

FIG. 13 shows a method for performing PUCCH transmission of a userequipment (UE) according to an exemplary embodiment of the presentinvention in a viewpoint of the UE.

FIG. 14 shows a user equipment (UE) for performing PUCCH transmissionaccording to an exemplary embodiment of the present invention, in aviewpoint of the UE.

FIG. 15 shows a method for performing PUCCH reception according to anexemplary embodiment of the present invention, in a viewpoint of a basestation.

FIG. 16 shows a user equipment (UE) for performing PUCCH transmissionaccording to an exemplary embodiment of the present invention, in theviewpoint of the base station.

FIG. 17 is a general schematization of a PUCCH transmission procedureaccording to an exemplary embodiment of the present invention based onFIG. 13 and FIG. 15.

FIG. 18 is a block diagram showing components of a transmitting device1810 and a receiving device 1820 for implementing the present invention.

FIG. 19 illustrates an example of a signal processing module structurein the transmitting device 1810.

FIG. 20 illustrates another example of the signal processing modulestructure in the transmitting device 1810.

FIG. 21 illustrates an example of a wireless communication deviceaccording to an implementation example of the present invention.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

FIG. 1 shows a wireless communication system to which the presentinvention may be applied. The wireless communication system may bereferred to as an Evolved-UMTS Terrestrial Radio Access Network(E-UTRAN) or a Long Term Evolution (LTE)/LTE-A system.

The E-UTRAN includes at least one base station (BS) 20 which provides acontrol plane and a user plane to a user equipment (UE) 10. The UE 10may be fixed or mobile, and may be referred to as another terminology,such as a mobile station (MS), a user terminal (UT), a subscriberstation (SS), a mobile terminal (MT), a wireless device, etc. The BS 20is generally a fixed station that communicates with the UE 10 and may bereferred to as another terminology, such as an evolved node-B (eNB), abase transceiver system (BTS), an access point, etc.

The BSs 20 are interconnected by means of an X2 interface. The BSs 20are also connected by means of an S1 interface to an evolved packet core(EPC) 30, more specifically, to a mobility management entity (MME)through S1-MME and to a serving gateway (S-GW) through S1-U.

The EPC 30 includes an MME, an S-GW, and a packet data network-gateway(P-GW). The MME has access information of the UE or capabilityinformation of the UE, and such information is generally used formobility management of the UE. The S-GW is a gateway having an E-UTRANas an end point. The P-GW is a gateway having a PDN as an end point.

Layers of a radio interface protocol between the UE and the network canbe classified into a first layer (L), a second layer (L2), and a thirdlayer (L3) based on the lower three layers of the open systeminterconnection (OSI) model that is well-known in the communicationsystem. Among them, a physical (PHY) layer belonging to the first layerprovides an information transfer service by using a physical channel,and a radio resource control (RRC) layer belonging to the third layerserves to control a radio resource between the UE and the network. Forthis, the RRC layer exchanges an RRC message between the UE and the BS.

FIG. 2 is a diagram showing a wireless protocol architecture for a userplane. FIG. 3 is a diagram showing a wireless protocol architecture fora control plane. The user plane is a protocol stack for user datatransmission. The control plane is a protocol stack for control signaltransmission.

Referring to FIGS. 2 and 3, a PHY layer provides an upper layer with aninformation transfer service through a physical channel. The PHY layeris connected to a medium access control (MAC) layer which is an upperlayer of the PHY layer through a transport channel. Data is transferredbetween the MAC layer and the PHY layer through the transport channel.The transport channel is classified according to how and with whatcharacteristics data is transferred through a radio interface.

Data is moved between different PHY layers, that is, the PHY layers of atransmitter and a receiver, through a physical channel. The physicalchannel may be modulated according to an Orthogonal Frequency DivisionMultiplexing (OFDM) scheme, and use the time and frequency as radioresources.

The functions of the MAC layer include mapping between a logical channeland a transport channel and multiplexing and demultiplexing to atransport block that is provided through a physical channel on thetransport channel of a MAC Service Data Unit (SDU) that belongs to alogical channel. The MAC layer provides service to a Radio Link Control(RLC) layer through the logical channel.

The functions of the RLC layer include the concatenation, segmentation,and reassembly of an RLC SDU. In order to guarantee various types ofQuality of Service (QoS) required by a Radio Bearer (RB), the RLC layerprovides three types of operation mode: Transparent Mode (TM),Unacknowledged Mode (UM), and Acknowledged Mode (AM). AM RLC provideserror correction through an Automatic Repeat Request (ARQ).

The RRC layer is defined only on the control plane. The RRC layer isrelated to the configuration, reconfiguration, and release of radiobearers, and is responsible for control of logical channels, transportchannels, and PHY channels. An RB means a logical route that is providedby the first layer (PHY layer) and the second layers (MAC layer, the RLClayer, and the PDCP layer) in order to transfer data between UE and anetwork.

The function of a Packet Data Convergence Protocol (PDCP) layer on theuser plane includes the transfer of user data and header compression andciphering. The function of the PDCP layer on the user plane furtherincludes the transfer and encryption/integrity protection of controlplane data.

What an RB is configured means a process of defining the characteristicsof a wireless protocol layer and channels in order to provide specificservice and configuring each detailed parameter and operating method. AnRB can be divided into two types of a Signaling RB (SRB) and a Data RB(DRB). The SRB is used as a passage through which an RRC message istransmitted on the control plane, and the DRB is used as a passagethrough which user data is transmitted on the user plane.

If RRC connection is established between the RRC layer of UE and the RRClayer of an E-UTRAN, the UE is in the RRC connected state. If not, theUE is in the RRC idle state.

A downlink transport channel through which data is transmitted from anetwork to UE includes a broadcast channel (BCH) through which systeminformation is transmitted and a downlink shared channel (SCH) throughwhich user traffic or control messages are transmitted. Traffic or acontrol message for downlink multicast or broadcast service may betransmitted through the downlink SCH, or may be transmitted through anadditional downlink multicast channel (MCH). Meanwhile, an uplinktransport channel through which data is transmitted from UE to a networkincludes a random access channel (RACH) through which an initial controlmessage is transmitted and an uplink shared channel (SCH) through whichuser traffic or control messages are transmitted.

Logical channels that are placed over the transport channel and that aremapped to the transport channel include a broadcast control channel(BCCH), a paging control channel (PCCH), a common control channel(CCCH), a multicast control channel (MCCH), and a multicast trafficchannel (MTCH).

The physical channel includes several OFDM symbols in the time domainand several subcarriers in the frequency domain. One subframe includes aplurality of OFDM symbols in the time domain. An RB is a resourcesallocation unit, and includes a plurality of OFDM symbols and aplurality of subcarriers. Furthermore, each subframe may use specificsubcarriers of specific OFDM symbols (e.g., the first OFDM symbol) ofthe corresponding subframe for a physical downlink control channel(PDCCH), that is, an L1/L2 control channel. A Transmission Time Interval(TTI) is a unit time for subframe transmission.

Hereinafter, radio resource management (RRM) measurement in LTE systemwill be described.

RRM operation including power control, scheduling cell search, cellreselection, handover, radio link or connection monitoring, connectionestablishment/re-establishment is supported in the LTE system. At thispoint, a serving cell may request RRM measurement information, which isa measurement value for performing RRM operation, to the UE. Typically,a UE may measure and report information such as cell search informationfor each cell, reference signal received power (RSRP), and referencesignal received quality (RSRQ) in the LTE system. Specifically, in theLTE system a UE receives a higher layer signal ‘measConfig’ for RRMmeasurement from the serving cell. The UE measures RSRP or RSRQaccording to the information ‘measConfig’. Here, reference signalreceived power (RSRP), reference signal received quality (RSRQ), andreceived signal strength indicator (RSSI) defined in the LTE system canbe defined as follows.

<RSRP>

Reference signal received power (RSRP), is defined as the linear averageover the power contributions (in [W]) of the resource elements thatcarry cell-specific reference signals within the considered measurementfrequency bandwidth. For RSRP determination the cell-specific referencesignals R0 according TS 36.211 shall be used. If the UE can reliablydetect that R1 is available it may use R1 in addition to R0 to determineRSRP. The reference point for the RSRP shall be the antenna connector ofthe UE. If receiver diversity is in use by the UE, the reported valueshall not be lower than the corresponding RSRP of any of the individualdiversity branches.

<RSRQ>

Reference Signal Received Quality (RSRQ) is defined as the ratioNxRSRP/(E-UTRA carrier RSSI), where N is the number of RB's of theE-UTRA carrier RSSI measurement bandwidth. The measurements in thenumerator and denominator shall be made over the same set of resourceblocks.

E-UTRA Carrier Received Signal Strength Indicator (RSSI), comprises thelinear average of the total received power (in [W]) observed only inOFDM symbols containing reference symbols for antenna port 0, in themeasurement bandwidth, over N number of resource blocks by the UE fromall sources, including co-channel serving and non-serving cells,adjacent channel interference, thermal noise etc. If higher-layersignalling indicates certain subframes for performing RSRQ measurements,then RSSI is measured over all OFDM symbols in the indicated subframes.The reference point for the RSRQ shall be the antenna connector of theUE. If receiver diversity is in use by the UE, the reported value shallnot be lower than the corresponding RSRQ of any of the individualdiversity branches.

<RSSI>

The received wide band power, including thermal noise and noisegenerated in the receiver, within the bandwidth defined by the receiverpulse shaping filter. The reference point for the measurement shall bethe antenna connector of the UE. If receiver diversity is in use by theUE, the reported value shall not be lower than the corresponding UTRAcarrier RSSI of any of the individual receive antenna branches.

According to the above definitions, a terminal operating in the LTEsystem is allowed to measure RSRP in a bandwidth corresponding to one of6, 15, 25, 50, 75, 100 resource blocks (RBs) through an informationelement (IE) related to an allowed measurement bandwidth transmitted insystem information block type 3 (SIB 3) in the case of anintra-frequency measurement, or through an IE related to an allowedmeasurement bandwidth transmitted in SIB 5 in the case of aninter-frequency measurement. Or, the UE may measure in the frequencyband of the entire DL system by default if the IEs do not exist. Here,when the UE receives the allowed measurement bandwidth, the UE considersthe corresponding value as a maximum measurement bandwidth and maymeasure the value of RSRP freely within the corresponding value.However, if the serving cell transmits an IE defined by wideband-RSRQ(WB-RSRQ), and the allowed measurement bandwidth is set to 50 RBs ormore, the UE shall calculate the RSRP value for the overall allowedmeasurement bandwidth. Meanwhile, the RSSI may be measured in thefrequency band of the receiver of the UE according to the definition ofthe RSSI bandwidth.

Hereinafter, a new radio access technology (new RAT, NR) will bedescribed.

As more and more communication devices require more communicationcapacity, there is a need for improved mobile broadband communicationover existing radio access technology. Also, massive machine typecommunications (MTC), which provides various services by connecting manydevices and objects, is one of the major issues to be considered in thenext generation communication. In addition, communication system designconsidering reliability/latency sensitive service/UE is being discussed.The introduction of next generation radio access technology consideringenhanced mobile broadband communication (eMBB), massive MTC (mMTC),ultrareliable and low latency communication (URLLC) is discussed. Thisnew technology may be called new radio access technology (new RAT or NR)in the present invention for convenience.

FIG. 4 illustrates a system structure of a next generation radio accessnetwork (NG-RAN) to which NR is applied.

Referring to FIG. 4, the NG-RAN may include a gNB and/or an eNB thatprovides user plane and control plane protocol termination to aterminal. FIG. 4 illustrates the case of including only gNBs. The gNBand the eNB are connected by an Xn interface. The gNB and the eNB areconnected to a 5G core network (5GC) via an NG interface. Morespecifically, the gNB and the eNB are connected to an access andmobility management function (AMF) via an NG-C interface and connectedto a user plane function (UPF) via an NG-U interface.

FIG. 5 illustrates a functional division between an NG-RAN and a 5GC.

The gNB may provide functions such as an inter-cell radio resourcemanagement (Inter Cell RRM), radio bearer management (RB control),connection mobility control, radio admission control, measurementconfiguration & provision, dynamic resource allocation, and the like.The AMF may provide functions such as NAS security, idle state mobilityhandling, and so on. The UPF may provide functions such as mobilityanchoring, PDU processing, and the like. The SMF may provide functionssuch as UE IP address assignment, PDU session control, and so on.

FIG. 6 illustrates an example of a frame structure that may be appliedin NR.

Referring to FIG. 6, a frame may be composed of 10 milliseconds (ms) andinclude 10 subframes each composed of 1 ms.

One or a plurality of slots may be included in a subframe according tosubcarrier spacings.

The following table 1 illustrates a subcarrier spacing configuration.

TABLE 1 μ Δf = 2^(μ) · 15[kHz] Cyclic prefix 0 15 Normal 1 30 Normal 260 Normal Extended 3 120 Normal 4 240 Normal

The following table 2 illustrates the number of slots in a frame(N^(frame,μ) _(slot)), the number of slots in a subframe (N^(subframe,μ)_(slot)), the number of symbols in a slot (N^(slot) _(symb)), and thelike, according to subcarrier spacing configurations.

TABLE 2 μ N_(symb) ^(slot) N_(slot) ^(frame, μ) N_(slot) ^(subframe, μ)0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

In FIG. 6, μ=0, 1, 2 is illustrated.

A physical downlink control channel (PDCCH) may include one or morecontrol channel elements (CCEs) as illustrated in the following table 3.

TABLE 3 Aggregation level Number of CCEs 1 1 2 2 4 4 8 8 16 16

That is, the PDCCH may be transmitted through a resource including 1, 2,4, 8, or 16 CCEs. Here, the CCE includes six resource element groups(REGs), and one REG includes one resource block in a frequency domainand one orthogonal frequency division multiplexing (OFDM) symbol in atime domain.

Meanwhile, in a future wireless communication system, a new unit calleda control resource set (CORESET) may be introduced. The terminal mayreceive the PDCCH in the CORESET.

FIG. 7 illustrates CORESET.

Referring to FIG. 7, the CORESET includes N^(CORESET) _(RB) number ofresource blocks in the frequency domain, and N^(CORESET) _(symb)∈{1, 2,3} number of symbols in the time domain. N^(CORESET) _(RB) andN^(CORESET) _(symb) may be provided by a base station via higher layersignaling. As illustrated in FIG. 7, a plurality of CCEs (or REGs) maybe included in the CORESET.

The UE may attempt to detect a PDCCH in units of 1, 2, 4, 8, or 16 CCEsin the CORESET. One or a plurality of CCEs in which PDCCH detection maybe attempted may be referred to as PDCCH candidates.

A plurality of CORESETs may be configured for the terminal.

FIG. 8 is a diagram illustrating a difference between a related artcontrol region and the CORESET in NR.

Referring to FIG. 8, a control region 800 in the related art wirelesscommunication system (e.g., LTE/LTE-A) is configured over the entiresystem band used by a base station (BS). All the terminals, excludingsome (e.g., eMTC/NB-IoT terminal) supporting only a narrow band, must beable to receive wireless signals of the entire system band of the BS inorder to properly receive/decode control information transmitted by theBS.

On the other hand, in NR, CORESET described above was introduced.CORESETs 801, 802, and 803 are radio resources for control informationto be received by the terminal and may use only a portion, rather thanthe entirety of the system bandwidth. The BS may allocate the CORESET toeach UE and may transmit control information through the allocatedCORESET. For example, in FIG. 8, a first CORESET 801 may be allocated toUE 1, a second CORESET 802 may be allocated to UE 2, and a third CORESET803 may be allocated to UE 3. In the NR, the terminal may receivecontrol information from the BS, without necessarily receiving theentire system band.

The CORESET may include a UE-specific CORESET for transmittingUE-specific control information and a common CORESET for transmittingcontrol information common to all UEs.

Meanwhile, NR may require high reliability according to applications. Insuch a situation, a target block error rate (BLER) for downlink controlinformation (DCI) transmitted through a downlink control channel (e.g.,physical downlink control channel (PDCCH)) may remarkably decreasecompared to those of conventional technologies. As an example of amethod for satisfying requirement that requires high reliability,content included in DCI can be reduced and/or the amount of resourcesused for DCI transmission can be increased. Here, resources can includeat least one of resources in the time domain, resources in the frequencydomain, resources in the code domain and resources in the spatialdomain.

In NR, the following technologies/features can be applied.

<Self-Contained Subframe Structure>

FIG. 9 illustrates an example of a frame structure for new radio accesstechnology.

In NR, a structure in which a control channel and a data channel aretime-division-multiplexed within one TTI, as shown in FIG. 9, can beconsidered as a frame structure in order to minimize latency.

In FIG. 9, a shaded region represents a downlink control region and ablack region represents an uplink control region. The remaining regionmay be used for downlink (DL) data transmission or uplink (UL) datatransmission. This structure is characterized in that DL transmissionand UL transmission are sequentially performed within one subframe andthus DL data can be transmitted and UL ACK/NACK can be received withinthe subframe. Consequently, a time required from occurrence of a datatransmission error to data retransmission is reduced, thereby minimizinglatency in final data transmission.

In this data and control TDMed subframe structure, a time gap for a basestation and a terminal to switch from a transmission mode to a receptionmode or from the reception mode to the transmission mode may berequired. To this end, some OFDM symbols at a time when DL switches toUL may be set to a guard period (GP) in the self-contained subframestructure.

<Analog Beamforming #1>

Wavelengths are shortened in millimeter wave (mmW) and thus a largenumber of antenna elements can be installed in the same area. That is,the wavelength is 1 cm at 30 GHz and thus a total of 100 antennaelements can be installed in the form of a 2-dimensional array at aninterval of 0.5 lambda (wavelength) in a panel of 5×5 cm. Accordingly,it is possible to increase a beamforming (BF) gain using a large numberof antenna elements to increase coverage or improve throughput in mmW.

In this case, if a transceiver unit (TXRU) is provided to adjusttransmission power and phase per antenna element, independentbeamforming per frequency resource can be performed. However,installation of TXRUs for all of about 100 antenna elements decreaseseffectiveness in terms of cost. Accordingly, a method of mapping a largenumber of antenna elements to one TXRU and controlling a beam directionusing an analog phase shifter is considered. Such analog beamforming canform only one beam direction in all bands and thus cannot providefrequency selective beamforming.

Hybrid beamforming (BF) having a number B of TXRUs which is smaller thanQ antenna elements can be considered as an intermediate form of digitalBF and analog BF. In this case, the number of directions of beams whichcan be simultaneously transmitted are limited to B although it dependson a method of connecting the B TXRUs and the Q antenna elements.

<Analog Beamforming #2>

When a plurality of antennas is used in NR, hybrid beamforming which isa combination of digital beamforming and analog beamforming is emerging.Here, in analog beamforming (or RF beamforming) an RF end performsprecoding (or combining) and thus it is possible to achieve theperformance similar to digital beamforming while reducing the number ofRF chains and the number of D/A (or A/D) converters. For convenience,the hybrid beamforming structure may be represented by N TXRUs and Mphysical antennas. Then, the digital beamforming for the L data layersto be transmitted at the transmitting end may be represented by an N byL matrix, and the converted N digital signals are converted into analogsignals via TXRUs, and analog beamforming represented by an M by Nmatrix is applied.

FIG. 10 is an abstract schematic diagram illustrating hybrid beamformingfrom the viewpoint of TXRUs and physical antennas.

In FIG. 10, the number of digital beams is L and the number of analogbeams is N. Further, in the NR system, by designing the base station tochange the analog beamforming in units of symbols, it is considered tosupport more efficient beamforming for a terminal located in a specificarea. Furthermore, when defining N TXRUs and M RF antennas as oneantenna panel in FIG. 7, it is considered to introduce a plurality ofantenna panels to which independent hybrid beamforming is applicable inthe NR system.

When a base station uses a plurality of analog beams as described above,analog beams suitable to receive signals may be different for terminalsand thus a beam sweeping operation of sweeping a plurality of analogbeams to be applied by a base station per symbol in a specific subframe(SF) for at least a synchronization signal, system information andpaging such that all terminals can have reception opportunities isconsidered.

FIG. 11 illustrates the beam sweeping operation for a synchronizationsignal and system information in a downlink (DL) transmission procedure.

In FIG. 11, physical resources (or a physical channel) in which systeminformation of the NR system is transmitted in a broadcasting manner isreferred to as a physical broadcast channel (xPBCH). Here, analog beamsbelonging to different antenna panels can be simultaneously transmittedwithin one symbol, and a method of introducing a beam reference signal(BRS) which is a reference signal (RS) to which a single analog beam(corresponding to a specific antenna panel) is applied in order tomeasure a channel per analog beam, as illustrated in FIG. 8, is underdiscussion. The BRS can be defined for a plurality of antenna ports, andeach antenna port of the BRS can correspond to a single analog beam.Here, all analog beams in an analog beam group are applied to thesynchronization signal or xPBCH and then the synchronization signal orxPBCH is transmitted such that an arbitrary terminal can successivelyreceive the synchronization signal or xPBCH.

Meanwhile, in relation to PUCCH and PUCCH resources, the followingrules/details may be applied.

UCI types reported in a PUCCH include HARQ-ACK information, SR, and CSI.UCI bits include HARQ-ACK information bits, SR information bits, or CSIbits.

A UE may transmit one or two PUCCHs on a serving cell in differentsymbols within a slot of N^(slot) _(symb) symbols. When the UE transmitstwo PUCCHs in a slot, at least one of the two PUCCHs uses PUCCH format 0or PUCCH format 2.

If a UE does not have dedicated PUCCH resource configuration, providedby higher layer parameter PUCCH-ResourceSet in PUCCH-Config, a PUCCHresource set is provided by higher layer parameter pucch-ResourceCommonin SystemInformationBlockType1 through an index to a row of Table 4 fortransmission of HARQ-ACK information on PUCCH in an initial active ULBWP of N_(size) ^(BWP) PRBs provided by SystemInformationBlockType1. ThePUCCH resource set includes sixteen resources, each corresponding to aPUCCH format, a first symbol, a duration, a PRB offset RB^(offset)_(BWP), and a cyclic shift index set for a PUCCH transmission. The UEtransmits a PUCCH using frequency hopping. An orthogonal cover code withindex 0 is used for a PUCCH resource with PUCCH format 1 in Table 4. TheUE transmits the PUCCH using the same spatial domain transmission filteras for the Msg3 PUSCH transmission.

The UE does not expect to generate more than one HARQ-ACK informationbit prior to establishing RRC connection.

If the UE provides HARQ-ACK information in a PUCCH transmission inresponse to detecting a DCI format 1_0 or DCI format 1_1, the UEdetermines a PUCCH resource with index r_(PUCCH), 0≤r_(PUCCH)≤15, as

${r_{PUCCH} = {\left\lfloor \frac{2 \cdot n_{{CCE},0}}{N_{CCE}} \right\rfloor + {2 \cdot \Delta_{PRI}}}},$

where N_(CCE) is a number of CCEs in a control resource set of a PDCCHreception with DCI format 1_0 or DCI format 1_1, n_(CCE,0) is the indexof a first CCE for the PDCCH reception, and Δ_(PRI) is a value of thePUCCH resource indicator field in the DCI format 1_0 or DCI format 1_1.

If └r_(PUCCH)/8┘=0,

-   -   the UE determines the PRB index of the PUCCH transmission in the        first hop as RB^(offset) _(BWP)+└r_(PUCCH)/N_(CS)┘ and the PRB        index of the PUCCH transmission in the second hop as N^(size)        _(BWP)−1−RB^(offset) _(BWP)−└r_(PUCCH)/N_(CS)┘, where N_(CS) is        the total number of initial cyclic shift indexes in the set of        initial cyclic shift indexes.    -   the UE determines the initial cyclic shift index in the set of        initial cyclic shift indexes as r_(PUCCH) mod N_(CS).

If └r_(PUCCH)/8┘=1,

-   -   the UE determines the PRB index of the PUCCH transmission in the        first hop as N^(size) _(BWP)−1−RB^(offset)        _(BWP)−└(r_(PUCCH)−8)/N_(CS)┘ and the PRB index of the PUCCH        transmission in the second hop as RB^(offset)        _(BWP)+└(r_(PUCCH)−8)/N_(CS)┘.    -   the UE determines the initial cyclic shift index in the set of        initial cyclic shift indexes as (r_(PUCCH)−8)mod N_(CS).

TABLE 4 PUCCH First Number PRB offset Set of initial Index format symbolof symbols RB_(BWP) ^(offset) CS indexes 0 0 12 2 0 {0, 3} 1 0 12 2 0{0, 4, 8} 2 0 12 2 3 {0, 4, 8} 3 1 10 4 0 {0, 6} 4 1 10 4 0 {0, 3, 6, 9}5 1 10 4 2 {0, 3, 6, 9} 6 1 10 4 4 {0, 3, 6, 9} 7 1 4 10 0 {0, 6} 8 1 410 0 {0, 3, 6, 9} 9 1 4 10 2 {0, 3, 6, 9} 10 1 4 10 4 {0, 3, 6, 9} 11 10 14 0 {0, 6} 12 1 0 14 0 {0, 3, 6, 9} 13 1 0 14 2 {0, 3, 6, 9} 14 1 014 4 {0, 3, 6, 9} 15 1 0 14 └N_(BWP) ^(size)/4┘ {0, 3, 6, 9}

If a UE has dedicated PUCCH resource configuration, the UE is providedby higher layers with one or more PUCCH resources.

A PUCCH resource includes the following parameters:

-   -   a PUCCH resource index provided by higher layer parameter        pucch-ResourceId    -   an index of the first PRB prior to frequency hopping or for no        frequency hopping by higher layer parameter startingPRB    -   an index of the first PRB after frequency hopping by higher        layer parameter secondHopPRB    -   an indication for intra-slot frequency hopping by higher layer        parameter intraSlotFrequencyHopping    -   a configuration for a PUCCH format, from PUCCH format 0 through        PUCCH format 4, provided by higher layer parameter format

If the higher layer parameter format indicates PUCCH-format0, the PUCCHformat configured for a PUCCH resource is PUCCH format 0, where thePUCCH resource also includes an index for an initial cyclic shiftprovided by higher layer parameter initialCyclicShift, a number ofsymbols for a PUCCH transmission provided by higher layer parameternrofSymbols, a first symbol for the PUCCH transmission provided byhigher layer parameter startingSymbolIndex.

If the higher layer parameter format indicates PUCCH-format1, the PUCCHformat configured for a PUCCH resource is PUCCH format 1, where thePUCCH resource also includes an index for an initial cyclic shiftprovided by higher layer parameter initialCyclicShift, a number ofsymbols for a PUCCH transmission provided by higher layer parameternrofSymbols, a first symbol for the PUCCH transmission provided byhigher layer parameter startingSymbolIndex, and an index for anorthogonal cover code by higher layer parameter timeDomainOCC.

If the higher layer parameter format indicates PUCCH-format2 orPUCCH-format3, the PUCCH format configured for a PUCCH resource is PUCCHformat 2 or PUCCH format 3, respectively, where the PUCCH resource alsoincludes a number of PRBs provided by higher layer parameter nrofPRBs, anumber of symbols for a PUCCH transmission provided by higher layerparameter nrofSymbols, and a first symbol for the PUCCH transmissionprovided by higher layer parameter startingSymbolIndex.

If the higher layer parameter format indicates PUCCH-format4, the PUCCHformat configured for a PUCCH resource is PUCCH format 4, where thePUCCH resource also includes a number of symbols for a PUCCHtransmission provided by higher layer parameter nrofSymbols, a lengthfor an orthogonal cover code by higher layer parameter occ-Length, anindex for an orthogonal cover code by higher layer parameter occ-Index,and a first symbol for the PUCCH transmission provided by higher layerparameter startingSymbolIndex.

A UE can be configured up to four sets of PUCCH resources. A PUCCHresource set is provided by higher layer parameter PUCCH-ResourceSet andis associated with a PUCCH resource set index provided by higher layerparameter pucch-ResourceSetId, with a set of PUCCH resource indexesprovided by higher layer parameter resourceList that provides a set ofpucch-ResourceId used in the PUCCH resource set, and with a maximumnumber of UCI information bits the UE can transmit using a PUCCHresource in the PUCCH resource set provided by higher layer parametermaxPayloadMinus1. For the first PUCCH resource set, the maximum numberof UCI information bits is 2. A maximum number of PUCCH resource indexesfor a set of PUCCH resources is provided by higher layer parametermaxNrofPUCCH-ResourcesPerSet. The maximum number of PUCCH resources inthe first PUCCH resource set is 32 and the maximum number of PUCCHresources in the other PUCCH resource sets is 8.

If the UE transmits N_(UCI) UCI information bits, that include HARQ-ACKinformation bits, the UE determines a PUCCH resource set to be asfollows:

-   -   a first set of PUCCH resources with pucch-ResourceSetId=0 if        N_(UCI)≤2 including 1 or 2 HARQ-ACK information bits and a        positive or negative SR on one SR transmission occasion if        transmission of HARQ-ACK information and SR occurs        simultaneously    -   a second set of PUCCH resources with pucch-ResourceSetId=1, if        provided by higher layers, if 2<N_(UCI)≤N₂ where N₂ is provided        by higher layer parameter maxPayloadMinus1 for the PUCCH        resource set with pucch-ResourceSetId=1    -   a third set of PUCCH resources with pucch-ResourceSetId=2, if        provided by higher layers, if N₂<N_(UCI)≤N₃ where N₃ is provided        by higher layer parameter maxPayloadMinus1 for the PUCCH        resource set with pucch-ResourceSetId=2    -   a fourth set of PUCCH resources with pucch-ResourceSetId=3, if        provided by higher layers, if N₃<N_(UCI)≤1706.

Hereinafter, the present invention will be described.

Flexibility is considered as an important design philosophy forsupporting various services in the NR system. Characteristically, whennaming a scheduling unit as a slot, a structure in which any slot may bedynamically changed to a physical downlink shared channel (PDSCH)transmission slot (hereinafter, DL slot) or a physical uplink sharedchannel (PUSCH) transmission slot (hereinafter, UL slot) will besupported. Here, PDSCH is a physical channel for transmitting DL dataand PUSCH is a physical channel for transmitting UL data. Hereinafter,the structure may be referred to as a dynamic DL/UL configuration. Whenthe dynamic DL/UL configuration is supported in the NR system, aphysical channel PUCCH transmitting hybrid automatic repeatrequest-acknowledgement (HARQ-ACK) information for the PDSCH scheduledin the DL slot and/or UL control information such as channel stateinformation (CSI) can be transmitted in an area where UL transmission ispossible.

The base station may indicate a PUCCH transmission to the UE through theDCI, and, at this point, a slot to which the PUCCH is to be transmitted,a starting symbol corresponds to a time point where the transmissionstarts within the corresponding slot, and a transmission duration timeindicating through how many symbols the transmission is to be carriedout should be notified. Additionally, in order to support multiplexingthrough which multiple user equipment transmit the PUCCH by using thesame frequency resource within the same symbol, an acknowledge resourceindicator (ARI) set, which is configured of a combination of a coderesource, such as an orthogonal cover code (OCC) and a cyclic shift(CS), and a frequency resource, shall be defined in order to allocateand indicate the PUCCH resources.

Hereinafter, in the present invention, DL assignment refers to DCIindicating PDSCH scheduling, UL grant refers to DCI indicating PUSCHscheduling, Short PUCCH refers to a PUCCH being transmitted at a1-symbol or 2-symbol transmission duration time, and Long PUCCH refersto a PUCCH that can be transmitted at a transmission duration from 4symbols to 14 symbols. An ARI PUCCH resource corresponds to a PUCCHresource through which Uplink control information, which includesHARQ-ACK, CSI, and so on, can be transmitted, and a CSI or SR PUCCHresource refers to an individual PUCCH resource for transmitting each ofCSI and SR. A Multi-beam PRACH refers to a case where the direction of aPRACH transmission beam of the UE or a PRACH reception beam of a gNB isvariable and not fixed.

When the UE fails to be allocated with a dedicated resource that is tobe used for the PUCCH transmission during the initial access procedureor fallback operation, and so on, the UE transmits an HARQ-ACK responseby using a PUCCH resource of a default PUCCH resource set, which isindicated through a remaining system information (RMSI) beingbroadcasted by the corresponding base station. Hereinafter, the presentinvention proposes a configuration and allocation method of a defaultPUCCH resource set and the PUCCH resources configuring the default PUCCHresource set.

The PUCCH format will first be described in detail.

A PUCCH transmitting an HARQ-ACK for the PDSCH which is scheduled via DLassignment or an Uplink control information (UCI) such as a CSI may beclassified into diverse PUCCH formats in accordance with a payload sizeand transmission duration time (number of PUCCH transmission symbols) ofthe corresponding UCI as described below. Herein, the numbers (orindexes) of each PUCCH format have been arbitrarily set up (or assigned)in order to differentiate each of the PUCCH formats from one another.

<PUCCH Format 0>

-   -   Size of available UCI payload: up to K bits (Hereinafter, K may        be set to K=2.)    -   Number of OFDM symbols configuring a single PUCCH: from 1 to X        symbols (Hereinafter, X may be set to X=2.)    -   Transmission structure: This format is configured only of UCI        signals and no Demodulation Reference Signal (DMRS). And, in        this structure, a specific UCI state may be transmitted by        selecting/transmitting one specific sequence, among a plurality        of specific sequences.

<PUCCH Format 1>

-   -   Size of available UCI payload: up to K bits    -   Number of OFDM symbols configuring a single PUCCH: from Y to Z        symbols (Hereinafter, Y may be set to Y=4, and Z may be set to        Z=14.)    -   Transmission structure: In this structure, DMRS and UCI are each        configured in/mapped to a different symbol in a Time Division        Multiplexing (TDM) format. Herein, the UCI is configured of a        specific sequence being multiplied by a modulation symbol (e.g.,        a Quadrature Phase Shift Keying (QPSK) symbol). And, CS/OCC is        applied to both the UCI and DMRS, thereby allowing multiplexing        between multiple UEs (or devices) to be supported (within the        same RB).

<PUCCH Format 2>

-   -   Size of available UCI payload: more than K bits    -   Number of OFDM symbols configuring a single PUCCH: from 1 to X        symbols    -   Transmission structure: In this structure, the DMRS and UCI are        configured in/mapped to the same symbol. And, in this structure,        transmission is performed by applying only Inverse Fast Fourier        Transform (IFFT) and not Discrete Fourier Transform (DFT) to the        coded UCI bits.

<PUCCH Format 3>

-   -   Size of available UCI payload: more than K bits    -   Number of OFDM symbols configuring a single PUCCH: from Y to Z        symbols    -   Transmission structure: In this structure, DMRS and UCI are each        configured in/mapped to a different symbol in a TDM format, and,        herein, transmission is performed by applying DFT to the coded        UCI bits. Also, in this structure, multiplexing between multiple        UEs may be supported by applying OCC at a fore end of the UCI        and by applying CS (or Interleaved Frequency Division        Multiplexing (IFDM)) to the DMRS.

<PUCCH Format 4>

-   -   Size of available UCI payload: more than K bits    -   Number of OFDM symbols configuring a single PUCCH: from Y to Z        symbols    -   Transmission structure: In this structure, DMRS and UCI are each        configured in/mapped to a different symbol in a TDM format, and,        herein, transmission is performed by applying DFT to the coded        UCI bits without performing multiplexing between multiple UEs.

If the UCI payload size that is to be transmitted to the base stationduring the initial access procedure or fallback operation, and so on, ofthe UE (or terminal or device) is equal to 2 bits or less, the PUCCHresource configuring a default PUCCH resource set may be configured onlyof PUCCH format 0 and PUCCH format 1, among the above-described 5 PUCCHformats.

The UEs near the base station may receive RMSI broadcasted by thecorresponding base station, and, accordingly, the UEs may acquireinformation on the PUCCH resource set that is to be used for thetransmission of an HARQ-ACK response during the initial access procedureor an HARQ-ACK response during the fallback operation from thecorresponding RMSI. For example, if the RMSI is equal to 4 bits, thenumber of the PUCCH resource sets that may be indicated as the RMSIstate may be equal to 16. And, Y number of PUCCH resources each having adifferent resource parameter combination (or set) may exist within eachPUCCH resource set.

The UE may determine one PUCCH resource that is to be used for the PUCCHtransmission by performing the procedure that is described below.

-   -   Step 0: 16 PUCCH resource sets are defined.    -   Step 1: One PUCCH resource set, among 16 PUCCH resource sets, is        configured by a 4-bit parameter within the RMSI.    -   Step 2: Among 4 subsets within the PUCCH resource sets, which is        configured by a 2-bit ARI field within the DCI, one subset is        selected.    -   Step 3: One PUCCH resource within a subset, which is implicitly        mapped by a PDCCH starting CCE index, may be selected.

However, in Step 2, the ARI field may be referred to as a PUCCH resourceindication field, and so on, and may be equal to 3 bits and not 2 bits.

When configuring the initial PUCCH resource set of Step 0 and Step 1,the following details shall be considered for the configurationflexibility of the network.

-   -   A PUCCH format within the configured PUCCH resource set (Herein,        the PUCCH format may correspond to PUCCH format 0 and PUCCH        format 1.)    -   A starting symbol and the number of symbols within a given PUCCH        format    -   A difference (or gap) in cyclic shift (CS) values between the        PUCCH resources (Herein, the difference may be equal to 1 or 2        or 3.)

Meanwhile, the resource parameters that should be configured in eachPUCCH resource, which configures the PUCCH resource set, and the rangeof the respective values are as shown below in Table 5.

TABLE 5 Format 0- Format 0- 1symbol 2symbol Format 1 Starting symbol 1312  0  4 Number of symbols  1  2 14 10 Frequency resource PRB 0, PRB 1,PRB 0 in 1^(st) hop → PRB N-1 in 2^(nd) hop PRB N-2, PRB PRB N-1 in1^(st) hop → PRB 0 in 2^(nd) hop N-1 PRB 1 in 1^(st) hop → PRB N-2 in2^(nd) hop PRB N-2 in 1^(st) hop → PRB 1 in 2^(nd) hop Hopping or notN.A. Always hop for Always hop 2-symbol Index of initial CS 0-11 0-110-11 Time-domain OCC N.A. N.A. 0, 1, 2 for 14- 0, 1 for 10- symbol.symbol

In other words, a PUCCH format, a starting symbol, a number of symbols,and an index of a starting CS for each PUCCH resource set may bepredefined. Herein, the above-described Table 5 is merely an example,and, therefore, the PUCCH resource sets may be defined to be configuredof diverse combinations. Additionally, as described above, PUCCHformats, starting symbols, number of symbols, and indexes of thestarting CSs for the total of 16 PUCCH resource sets may also bepredefined.

With the exception for a 1-symbol PUCCH format 0, transmission is alwaysperformed while frequency hopping is in an on state for frequencydiversity gain. In Table 5, when N number of physical resource blocks(PRBs) exist in an initial uplink bandwidth part (UL BWP), the frequencyresource corresponds to a case where indexing is sequentially performedstarting from a lowest frequency PRB as PRB 0. The following methods maybe considered as the PRB allocation method.

-   -   Option 1: A method of sequentially assigning indexes starting        from PRBs positioned at each end of the band in order to        maximize frequency diversity, such as PUCCH format 1 of the LTE.

FIG. 12 is an example for describing a PRB resource allocation method ofthe above-described Method 1.

(Example 1) In case of a 1-symbol short PUCCH, as shown in (a) of FIG.12, the position of the starting symbol corresponds to a last symbol(e.g., a 14^(th) symbol) of the slot. And, therefore, indexes arealternately assigned (or allocated) starting from the PRBs located atboth ends of the initial UL BWP within the corresponding symbol (e.g.,PRB 0 (the lowest PRB)→PRB N−1 (the highest PRB)→PRB 1 (the secondlowest PRB)→PRB N−2 (the second highest PRB)→ . . . ).

(Example 2) In case of a 2-symbol short PUCCH, as shown in (b) of FIG.12, the position of the starting symbol corresponds to a second lastsymbol (e.g., a 13^(th) symbol) of the slot. And, therefore, indexes arealternately assigned (or allocated) starting from the PRBs located atboth ends of the initial UL BWP within the corresponding symbol.However, in this case, in case the transmission is carried out whileperforming frequency hopping, the lowest PRB of the 13^(th) symbol andthe highest PRB of the 14^(th) symbol configure the 2-symbol PUCCH(e.g., PRB 0 of the 13^(th) symbol, PRB N−1 of the 14^(th) symbol→PRBN−1 of the 13^(th) symbol, PRB 0 of the 14^(th) symbol→ . . . )

-   -   Option 2: A method of assigning a PRB starting index through        cell ID based arithmetic operation in order to reduce inter-cell        interference.

(Example 1) If PUCCH resources are allocated by always indexing thelowest PRB of the UL BWP as PRB 0, there is a likelihood of mutualinterference between the cells when a neighboring cell uses the same PRBresource as its PUCCH resource. Accordingly, resource collision andinterference may be avoided (or prevented) by performing an arithmeticoperation, such as modulo (Cell ID, Z) (wherein Z may be set to Z=4), onthe PRB starting index. For the remaining PRB allocation, just asdescribed in Option 1, if N number of PRBs exist in the UL BWP,allocation is alternately performed starting from the PRBs located atsymmetrical positions based on a N/2 point and progressing further awayfrom the center of the UL BWP.

Meanwhile, a method for configuring a default PUCCH resource set andPUCCH resources within each set may correspond to the following methods,which are described below.

-   -   Set type 1: A resource set being configured of a combination of        a single PUCCH format and a single {starting symbol position,        number of symbols} set.    -   Set type 2: A resource set being configured of a combination of        a single PUCCH format and multiple {starting symbol position,        number of symbols} sets.    -   Set type 3: A resource set being configured of a combination of        multiple PUCCH formats and multiple {starting symbol position,        number of symbols} sets.    -   A difference value (or gap value) (hereinafter, Δ_(CS)) between        the cyclic shifts (CSs) may be differently configured for each        resource set.

In (4), which is presented above, Δ_(CS) is defined as a different in CSvalues between adjacent PUCCH resource CSs within the same PRB, and itmay be considered to individually (or separately) configure a PUCCHresource set for each Δ_(CS) value in common for all of theabove-described cases. Additionally, in case of PUCCH format 0, when aCS index of an ACK sequence is given as x, a CS value of a NACK sequencemay be paired and assigned (or allocated) with x+6, and, during theinitial access procedure, the NACK sequence may not be transmitted. TheCS capacity may be equal to 12/Δ_(CS)/2 (e.g., per PRB). And, in case ofPUCCH format 1, the OCC capacity is respectively equal to 3 or 2depending upon the number of symbols, i.e., 14 symbols or 10 symbols,and the CS capacity is equal to 12/Δ_(CS). Additionally, for themultiplexing capacity of the PUCCH and an efficient resource allocation,the number of PRBs per PUCCH resource may be configured by using the twomethods, which are described below.

-   -   Alternative 1: A method of equally supporting a multiplexing        capacity per PUCCH resource set for each Δ_(CS) value.

(Total number of PRBs per PUCCH resource set=Δ_(CS)*N)

-   -   Alternative 2: A method of equally configuring a number of PRBs        per PUCCH resource set for each Δ_(CS) value.

(Total number of PRBs per PUCCH resource set=M)

When one PUCCH resource set is determined by using the RMSI based on theabove-described methods, as a method for selecting a subset within thecorresponding set, one subset may be selected from 4 subsets through a2-bit ARI field within a Message 4 (Msg 4) scheduling DCI during theinitial access procedure or through a 2-bit ARI field within a fallbackDCI during the fallback operation. In this case, the ARI indicationpurpose within the DCI for each option may be interpreted as describedbelow.

-   -   Option 1: In case of Set type 1, if all PUCCH resources within        the PUCCH resource set have only one type of {starting symbol        position, number of symbols}, a PRB-unit offset may be given as        the DCI (ARI) in order to change the frequency resource. For        example, in case 4 subsets exist in one PUCCH resource set, each        subset may be configured of different PRB resources, and one        subset may be indicated through the 2-bit ARI field within        the DCI. As another example, in case of Alternative 1, the        number of PRBs per subset may be configured to be equal to        (Δ_(CS)*N)/4, and, in case of Alternative 2, the number of PRBs        per subset may be configured to be equal to M/4.    -   Option 2: In case of Set type 2, if the PUCCH resources within        the PUCCH resource set have multiple types of {starting symbol        position, number of symbols}, a change in the time and frequency        resources, i.e., a {starting symbol position, number of symbols}        shift, and a PRB-unit offset may be indicated by using the DCI        (ARI). For example, when 4 subsets are configured of a        combination of 2 types of PRB sets and 2 types of {starting        symbol position, number of symbols}, one subset may be indicated        by indicating a change in the time and frequency resources        through the DCI (ARI).

For example, in case the PUCCH resource set is configured of 2 PRBs, PRBindex 1 and PRB index 2, and is also configured of 2 types of {startingsymbol position, number of symbols}, {S1, D1} and {S2, D2}, the 4subsets may be configured of a combination of [PRB index 1, {S1, D1}],[PRB index 1, {S2, D2}], [PRB index 2, {S1, D1}], [PRB index 2, {S2,D2}]. As another example, in case of Alternative 1, the number of PRBsper subset may be configured to be equal to (Δ_(CS)*N)/2, and, in caseof Alternative 2, the number of PRBs per subset may be configured to beequal to M/2.

-   -   Option 3: In case of Set type 3, if the PUCCH resources within        the PUCCH resource set have multiple types of {starting symbol        position, number of symbols}, among 4 {starting symbol position,        number of symbols}, one {starting symbol position, number of        symbols} may be indicated by using the DCI (ARI). For example,        when 4 subsets are configured of a combination of 4 types of        {starting symbol position, number of symbols}, one subset may be        indicated by using the 2-bit ARI field within the DCI. This        indicates that the PUCCH resource according to the 4 types of        {starting symbol position, number of symbols} combinations may        be configured within the same PRB set, and, more specifically,        this indicates that the PUCCH resources are configured in        accordance with the {starting symbol position, number of        symbols} combinations indicated by the DCI within the same PRB        set. As another example, in case of Alternative 1, the number of        PRBs per subset may be configured to be equal to (Δ_(CS)*N),        and, in case of Alternative 2, the number of PRBs per subset may        be configured to be equal to M.

When one subset is selected within the PUCCH resource set by using theabove-described options, a method of selecting one PUCCH resource withinthe selected subset for each PUCCH format may be as described below.

(1) PUCCH Format 1

A PUCCH resource having one {PRB index, CS index, OCC index} may beselected from a PDCCH starting CCE index. For example, in case thenumber of PRBs per subset is equal to N, and, given that Δ_(CS)=d, incase the CS capacity is equal to 12/d and the OCC capacity is equal toM, among the {N*(12/d)*M} number of PUCCH resources within the subset,one PUCCH resource may be indicated as {PDCCH starting CCE index} modulo{N*(12/d)*M}.

(2) PUCCH Format 0

A PUCCH resource having one {PRB index, CS index pair (x, x+6)} may beselected from a PDCCH starting CCE index. For example, in case thenumber of PRBs per subset is equal to N, and, given that Δ_(CS)=d, incase the CS capacity is equal to 12/d/2=6/d, among the {M*(6/d)} numberof PUCCH resources within the subset, once PUCCH resource may beindicated as {PDCCH starting CCE index} modulo {M*(6/d)}.

Another method for implicitly determining one subset within the PUCCHresource set and one PUCCH resource within the determined (or selected)subset will now be described. When all PUCCH resources (e.g., assumingthat K number of PUCCH resources exist) are indexed in accordance with aspecific rule starting from 0 to K−1 (0, 1, . . . , K−1), a final PUCCHresource index may be determined as {L+S}, by indicating a large offsethaving a granularity of L=0, K/4, K/2, 3K/4 by using the 2-bit ARI fieldwithin the DCI and by assigning a small offset, such as S=(PDCCHstarting CCE index) modulo (K/4), when one PUCCH resource is indicatedwithin the subset.

According to the description presented above, the indexing method of thePUCCH resources configuring the PUCCH resource set may vary dependingupon the PUCCH format. For example, in case of PUCCH format 1, theindexing may be performed by an order of “Index of a cyclic shift,Time-domain OCC index, PRB index”, and, in case of PUCCH format 0, theindexing may be performed in an order of “Index of an initial cyclicshift, PRB index”. For example, when 12 PUCCH resources configure onePUCCH resource set according to PUCCH format 1 having 10 symbols, andwhen it is assumed that 2 pairs of PRBs, Δ_(CS)=3, and the PRBallocation Option 1 are used, the resource indexing may be performed asshown below in Table 6. Similarly, when a PUCCH resource set isconfigured of 8 PUCCH resources according to PUCCH format 0 having 2symbols, and when it is assumed that 2 PRBs and Δ_(CS)=3 are used, theresource indexing may be performed as shown below in Table 7. Table 6corresponds to an example of PUCCH format 1 resource indexing, and Table7 corresponds to an example of PUCCH format 1 resource indexing.

TABLE 6 Resource 1^(st) hop starting Index of Index of time- index PRBindex cyclic shift domain OCC 1 PRB 0 0 0 2 PRB 0 3 0 3 PRB 0 6 0 4 PRB0 9 1 5 PRB 0 0 1 6 PRB 0 3 1 7 PRB N-1 6 0 8 PRB N-1 9 0 9 PRB N-1 0 010 PRB N-1 3 1 11 PRB N-1 6 1 12 PRB N-1 9 1

TABLE 7 Resource index Starting PRB index Index of cyclic shift 1 PRB 00 2 PRB 0 3 3 PRB 0 6 4 PRB 0 9 5 PRB N-1 0 6 PRB N-1 3 7 PRB N-1 6 8PRB N-1 9

As another PUCCH resource indexing method, in case of PUCCH format 1,indexing may be performed by an order of “PRB index, index of cyclicshift, time-domain OCC index” and, in case of PUCCH format 0, indexingmay be performed by an order of “PRB index, index of initial cyclicshift”. Under such indexing, if a CS gap Δ_(CS) is differentlyconfigured for each subset, a subset with a different multiplexingcapacity per PRB may be dynamically selected through an ARI field withinMsg. 4 DCI or fallback DCI. For example, for PUCCH format 1, 2 subsetseach having a different Δ_(CS) value exist within the PUCCH resourceset. When it is given that Δ_(CS)=2 and Δ_(CS)=3, indexing may beperformed as shown in the example of Table 8 shown below. Also, forPUCCH format 0, 2 subsets each having a different Δ_(CS) value existwithin the PUCCH resource set. When it is given that Δ_(CS)=2 andΔ_(CS)=3, indexing may be performed as shown in the example of Table 9shown below. Therefore, after selecting a specific PUCCH resource setthrough the RMSI, during the initial access procedure, subsets (subsetseach having a different multiplexing capacity per PRB) configured tohave a specific CS gap Δ_(CS) may be dynamically indicated through theARI within Msg. 4 DCI or fallback DCI. Table 8 corresponds to an exampleof PUCCH format 1 resource indexing, and Table 9 corresponds to anexample of PUCCH format 1 resource indexing.

TABLE 8 Resource Resource 1^(st) hop starting Index of Index of time-subset index PRB index cyclic shift domain OCC Subset 1 1 PRB 0 0 0 2PRB 0 2 0 3 PRB 0 4 0 4 PRB 0 6 0 5 PRB 0 8 0 6 PRB 0 10 0 7 PRB 0 0 1 8PRB 0 2 1 9 PRB 0 4 1 10 PRB 0 6 1 11 PRB 0 8 1 12 PRB 0 10 1 Subset 2 1PRB N-1 0 0 2 PRB N-1 3 0 3 PRB N-1 6 0 4 PRB N-1 9 0 5 PRB N-1 0 1 6PRB N-1 3 1 7 PRB N-1 6 1 8 PRB N-1 9 1

TABLE 9 Resource Resource Starting Index of subset index PRB indexcyclic shift Subset 1 1 PRB 0 0 2 PRB 0 2 3 PRB 0 4 4 PRB 0 6 5 PRB 0 86 PRB 0 10 Subset 2 1 PRB N-1 0 2 PRB N-1 3 3 PRB N-1 6 4 PRB N-1 9

Meanwhile, when K number of PUCCH resources are configured in one PUCCHresource set, in case the corresponding K value is not equal to amultiple of 4, e.g., in case a resource set being configured of PUCCHformat 1 is configured of {PRB=1, Δ_(CS)=2 (CS capacity=6), OCCcapacity=3}, the K value may be set to K=18, and, when determining alarge offset L value, such as L=0, L=floor(K/4), . . . , or L=0,L=ceil(K/4), . . . , the configured may be needed to be performed byusing a ceiling( ) or floor( ) function. In this case, even in case of asmall offset S, the corresponding value may be determined by S=(PDCCHstarting CCE index) modulo floor(K/4) or S=(PDCCH starting CCE index)modulo ceil(K/4).

Examples of configuring the initial PUCCH resource set for thedescription presented above by using 4 different methods arerespectively shown below in Table 10 to Table 13. Table 10 is an exampleof a case where a single Δ_(CS) value is configured per resource set(herein, Set Index 15 of Table 10 is exclusively assigned with a levelof freedom in selecting the base station for Δ_(CS)). And, Table 11 isan example of a case where all resource sets are configured of a singlePUCCH format and a single Δ_(CS) value or multiple Δ_(CS) values. And,Table 12 and Table 13 are examples of a case where the resource sets areconfigured of a plurality of {starting symbol position, number ofsymbols} sets (wherein Set #4/5/6/7 are mainly excluded for the purposeof FDD, and wherein Set #0/1/2/3 are mainly excluded for the purpose ofTDD).

TABLE 10 Set index PUCCH format {start symbol index, duration} CS gapvalue 0 0 {13, 1} 1 1 0 {13, 1} 2 2 0 {13, 1} 3 3 0 {13, 1}, {12, 2} 1 40 {13, 1}, {12, 2} 2 5 0 {13, 1}, {12, 2} 3 6 1 {0, 14} 1 7 1 {0, 14} 28 1 {0, 14} 3 9 1 {0, 14}, {3, 10} 1 10 1 {0, 14}, {3, 10} 2 11 1 {0,14}, {3, 10} 3 12 0, 1 {13, 1}, {12, 2}, {0, 14}, {3, 10} 1 13 0, 1 {13,1}, {12, 2}, {0, 14}, {3, 10} 2 14 0, 1 {13, 1}, {12, 2}, {0, 14}, {3,10} 3 15 0, 1 {13, 1}, {12, 2}, {0, 14}, {3, 10} 1, 2, 3

TABLE 11 Set index PUCCH format {start symbol index, duration} CS gapvalue 0 0 {13, 1} 1 1 0 {13, 1} 2 2 0 {13, 1} 3 3 0 {13, 1} 1, 2, 3 4 0{13, 1}, {12, 2} 1 5 0 {13, 1}, {12, 2} 2 6 0 {13, 1}, {12, 2} 3 7 0{13, 1}, {12, 2} 1, 2, 3 8 1 {0, 14} 1 9 1 {0, 14} 2 10 1 {0, 14} 3 11 1{0, 14} 1, 2, 3 12 1 {0, 14}, {3, 10} 1 13 1 {0, 14}, {3, 10} 2 14 1 {0,14}, {3, 10} 3 15 1 {0, 14}, {3, 10} 1, 2, 3

TABLE 12 Set index PUCCH format {start symbol index, duration} CS gapvalue 0 0 {13, 1}, {12, 2} 1 1 0 {13, 1}, {12, 2} 2 2 0 {13, 1}, {12, 2}3 3 0 {13, 1}, {12, 2} 1, 2, 3 4 1 {0, 14} 1 5 1 {0, 14} 2 6 1 {0, 14} 37 1 {0, 14} 1, 2, 3 8 1 {0, 14}, {3, 10} 1 9 1 {0, 14}, {3, 10} 2 10 1{0, 14}, {3, 10} 3 11 1 {0, 14}, {3, 10} 1, 2, 3 12 0, 1 {13, 1}, {12,2}, {0, 14}, {3, 10} 1 13 0, 1 {13, 1}, {12, 2}, {0, 14}, {3, 10} 2 140, 1 {13, 1}, {12, 2}, {0, 14}, {3, 10} 3 15 0, 1 {13, 1}, {12, 2}, {0,14}, {3, 10} 1, 2, 3

TABLE 13 Set index PUCCH format {start symbol index, duration} CS gapvalue 0 0 {13, 1} 1 1 0 {13, 1} 2 2 0 {13, 1} 3 3 0 {13, 1} 1, 2, 3 4 1{0, 14} 1 5 1 {0, 14} 2 6 1 {0, 14} 3 7 1 {0, 14} 1, 2, 3 8 1 {0, 14},{3, 10} 1 9 1 {0, 14}, {3, 10} 2 10 1 {0, 14}, {3, 10} 3 11 1 {0, 14},{3, 10} 1, 2, 3 12 0, 1 {13, 1}, {12, 2}, {0, 14}, {3, 10} 1 13 0, 1{13, 1}, {12, 2}, {0, 14}, {3, 10} 2 14 0, 1 {13, 1}, {12, 2}, {0, 14},{3, 10} 3 15 0, 1 {13, 1}, {12, 2}, {0, 14}, {3, 10} 1, 2, 3

The above-described configuration and allocation method of a defaultPUCCH resource set may be summarized by the proposed methods that arepresented below.

[Proposed Method #1] Each of a plurality of PUCCH resource sets may beconfigured only of a single PUCCH format and a single combination of{start/duration} and a single CS gap. In other words, at least one ofPUCCH format, {start/duration}, CS gap may be differently configuredbetween different sets.

[Proposed Method #2] Each of a plurality of PUCCH resource sets may beconfigured of a single PUCCH format and a single or multiplecombinations of {start/duration} and a single CS gap. In other words, atleast one of PUCCH format, CS gap may be differently configured betweendifferent sets.

[Proposed Method #3] Each of a plurality of PUCCH resource sets may beconfigured of a single PUCCH format and a single or multiplecombinations of {start/duration} and a single or multiple CS gaps. Inother words, the PUCCH format may be differently configured or a{start/duration} and CS gap combination may be differently configuredbetween different sets.

[Proposed Method #4] Each of a plurality of PUCCH resource sets may beconfigured of a single or multiple PUCCH formats and a single ormultiple combinations of {start/duration} and a single CS gap. In otherwords, the CS gap may be differently configured or a PUCCH format and acombination of {start/duration} may be differently configured betweendifferent sets.

[Proposed Method #5] Each of a plurality of PUCCH resource sets may beconfigured of a single or multiple PUCCH formats and a single ormultiple combinations of {start/duration} and a single or multiple CSgaps.

FIG. 13 shows a method for performing PUCCH transmission of a userequipment (UE) according to an exemplary embodiment of the presentinvention in a viewpoint of the UE.

According to FIG. 13, the user equipment (UE) receives systeminformation from a base station (S1310). Herein, the system informationmay include information for a PUCCH resource set of a plurality of PUCCHresource sets. Herein, each of the plurality of PUCCH resource sets maybe related to a starting symbol, a number of symbols, and a PUCCHformat. Additionally, herein, each of the plurality of PUCCH resourcesets may be related to a combination of a starting symbol and a numberof symbols, and a PUCCH format.

Thereafter, the UE performs PUCCH transmission based on a PUCCH resourcein the PUCCH resource set (S1320).

Herein, the plurality of PUCCH resource sets may be predefined. Also,herein, the number of the predefined PUCCH resource sets may be equal to16. Also, herein, each of the predefined plurality of PUCCH resourcesets may be related to PUCCH format 0 or PUCCH format 1. Also, herein,the number of symbols in each of the predefined plurality of PUCCHresource sets may include 2 symbols, 10 symbols, and 14 symbols. Also,herein, the system information may be Remaining System Information(RMSI). Also, herein, each of the plurality of PUCCH resource sets maybe configured to have a different gap value (or difference value)between cyclic shifts (CSs). Also, herein, the UE may be to a device (oruser equipment) that is not configured to have a dedicated PUCCHresource. Also, herein, the PUCCH transmission may be an HARQ-ACKtransmission of an initial access (IA) procedure. Also, herein, the onePUCCH resource may be selected based on the DCI and/or CCE index.

In other words, based on the above-described [Proposed Method #1], theexemplary embodiment of the present invention that is described in FIG.13 relates to a method of performing PUCCH transmission by a userequipment (UE) by selecting a PUCCH resource set for the PUCCHtransmission, in a case where each of the PUCCH resource sets isconfigured of one starting symbol, one number of symbols, and one PUCCHformat. Herein, one PUCCH resource set may be configured of onecombination of a single starting symbol and number of symbols, and onePUCCH format. Herein, the plurality of PUCCH resource sets (e.g., 16PUCCH resource sets) may be predefined and may be defined as shown inTable 4 and Table 5. Also, herein, the above-described method may berestrictedly used for the HARQ-ACK transmission in an initial accessstep (or phase) or a fallback step. Also, herein, the above-describedmethod may be used until a point prior to the configuration of adedicated PUCCH resource in the UE. Also, herein, when the UE isconfigured to have a dedicated PUCCH resource, the dedicated PUCCH maybe used at a higher priority level as compared to the predeterminedplurality of PUCCH resource sets.

By performing the above-described method, PUCCH transmission resourceselection and its respective PUCCH transmission may be more efficientlyachieved in the NR system, which considers flexibility and adopts a newstructure.

FIG. 14 shows a user equipment (UE) for performing PUCCH transmissionaccording to an exemplary embodiment of the present invention, in aviewpoint of the UE.

According to FIG. 14, a processor (1400) may include a systeminformation receiving unit (1410) and a PUCCH transmission performingunit (1420). Herein, the processor may refer to a processor of a userequipment (UE) that will be described later on with reference to FIG. 18to FIG. 21.

The system information receiving unit (1410) may receive systeminformation being transmitted from the base station. The systeminformation may include information on one PUCCH resource set, among aplurality of PUCCH resource sets. Since a detailed example of the systeminformation and a configuration for receiving the system informationhave already been described above, overlapping description of the samewill be omitted.

The PUCCH transmission performing unit (1420) may perform the PUCCHtransmission based on the received system information. Since a detailedexample of a configuration for performing the PUCCH transmission hasalready been described above, overlapping description of the same willbe omitted.

FIG. 15 shows a method for performing PUCCH reception according to anexemplary embodiment of the present invention, in a viewpoint of a basestation.

According to FIG. 15, the base station may transmit system informationto a user equipment (UE) (S1510). Herein, the base station may transmitthe system information by broadcasting the corresponding systeminformation. Also, herein, the system information may includeinformation on one PUCCH resource set, among a plurality of PUCCHresource sets. Since a detailed example of the system information and aconfiguration for transmitting the system information have already beendescribed above, overlapping description of the same will be omitted.

Thereafter, the base station may receive a PUCCH from the user equipment(UE) (S1520). Herein, the PUCCH may be transmitted based on one PUCCHresource set, among a plurality of PUCCH resource sets. Since a detailedexample of a configuration for receiving the PUCCH has already beendescribed above, overlapping description of the same will be omitted.

FIG. 16 shows a user equipment (UE) for performing PUCCH transmissionaccording to an exemplary embodiment of the present invention, in theviewpoint of the base station.

According to FIG. 16, a processor (1600) may include a systeminformation transmitting unit (1610) and a PUCCH receiving unit (1620).Herein, the processor may refer to a processor of a user equipment (UE)that will be described later on with reference to FIG. 18 to FIG. 21.

The system information transmitting unit (1610) may transmit systeminformation to the UE. Herein, since a detailed example of the systeminformation and a configuration for transmitting the system informationhave already been described above, overlapping description of the samewill be omitted.

The PUCCH receiving unit (1620) may receive a PUCCH that is transmittedby the UE. Herein, the PUCCH resource set may be determined by the UEbased on the receive system information. Since a detailed example of aconfiguration for receiving the PUCCH has already been described above,overlapping description of the same will be omitted.

FIG. 17 is a general schematization of a PUCCH transmission procedureaccording to an exemplary embodiment of the present invention based onFIG. 13 and FIG. 15.

According to FIG. 17, the UE receives system information from the basestation (S1710). Herein, the system information may include informationon one PUCCH resource set, among a plurality of PUCCH resource sets.Herein, each of the plurality of PUCCH resource sets may be related toone starting symbol, one number of symbols, and one PUCCH format.Additionally, herein, each of the plurality of PUCCH resource sets maybe related to one combination of a starting symbol and a number ofsymbols, and one PUCCH format.

Thereafter, the UE selects one PUCCH resource from the one PUCCHresource set (S1720). Herein, the UE receives the DCI, and, afterwards,the UE may select one PUCCH resource from the PUCCH resources existingin one PUCCH resource set among the plurality of PUCCH resource sets, byusing the number of Control Channel Elements (CCEs) existing in acontrol resource set for the reception of the PDCCH having DCI format1_0 or DCI format 1_1, an index of a first CCE for the PDCCH reception,and a PUCCH resource indicator field within the DCI format 1_0 or DCIformat 1_1. For this, as described above, an equation of

$r_{PUCCH} = {\left\lfloor \frac{2 \cdot n_{{CCE},0}}{N_{CCE}} \right\rfloor + {2 \cdot \Delta_{PRI}}}$

may be used. Herein, N_(CCE) indicates a number of Control ChannelElements (CCEs) existing in a control resource set for the reception ofthe PDCCH having DCI format 1_0 or DCI format 1_1, n_(CCE) indicates anindex of a first CCE for the PDCCH reception, and Δ_(PRI) indicates aPUCCH resource indicator field within the DCI format 1_0 or DCI format1_1.

Alternatively, as described above, the UE may select one subset from 4subsets within the PUCCH resource set tat is configured through the2-bit ARI field, which is included in the DCI, and the UE may alsoselect one PUCCH resource within a subset that is implicitly mapped fromthe PDCCH starting CCE index. However, this is merely part of diverseexamples. And, therefore, other diverse methods disclosed in thisspecification and a combination of two or more of such methods may beused.

Thereafter, the UE performs PUCCH transmission based on the selectedPUCCH resource (S1730). Herein, the PUCCH transmission may be anHARQ-ACK transmission.

Meanwhile, in case the PUCCH format 0 considers an operation of notperforming PUCCH transmission in case of a NACK during the initialaccess procedure, the CS capacity is equal to 12/Δ_(CS). In this case,the default PUCCH resource set configuration may be predefined or basedon a specific rule as a resource set having no CS pairing and being usedfor the initial access procedure and a fallback-dedicated CS pairingresource set, and, then, it may be considered to follow the defaultPUCCH resource set being defined for the usage in the initial accessprocedure, and, then, when a fallback operation is indicated, it may beconsidered to transmit the PUCCH by implicitly using the resource of afallback-dedicated default PUCCH resource set. For example, if the PUCCHresource set for the initial access procedure uses 6 CS resources perPRB, the fallback-dedicated PUCCH resource set may use the resourceswithin the corresponding PRBs by sequentially grouping 2 resources to 3sets (or groups), as agreed in advance.

Additionally, when a CS resource is allocated to the resources includedin the default PUCCH resource set for PUCCH format 0, due to animbalance in the number of CS resources per PRB within a set, a CSresource pair of an ACK/NACK sequence that is to be used by a PUCCH of aPDSCH, which is scheduled with a normal DCI by the same PRB, may belimited (or restricted). Therefore, instead of performing consecutive CSindex allocation, indexing may be performed by determining a specificrule. For example, in case of PUCCH format 0, when it is assumed thatΔ_(CS)=2 and one PUCCH resource set is configured of a total of 6resources and 2 PRBS, when each of resource #1 to resource #4respectively allocates CS resource 0/3/6/9 to PRB 0, and when each ofresource #5 and resource #6 respectively allocates CS resource 0/3 toPRB 1, an imbalance in the CS resources per PRB occurs, and, as aresult, in PRB 1, the PUCCH for a normal PDSCH becomes incapable ofusing all of CS resource (0, 6), (3, 9) (the ACK/NACK sequence should bepaired at a CS gap (or difference) of 6). Therefore, if each of resource#1 to resource #4 respectively allocates CS resource 0/6/3/9 to PRB 0,and when each of resource #5 and resource #6 respectively allocates CSresource 0/6 to PRB 1, the PUCCH for the normal PDSCH may be capable ofusing all of the remaining CS resources (1, 7), (2, 8), (3, 9), (4, 10)excluding (0, 6).

Additionally, for PUCCH format 1, considering the transmission of PUCCHformat 0 to the 12^(th) or 13^(th) symbol within a slot, thetransmission may be performed in a shortened PUCCH format excluding the12^(th) and 13^(th) symbols. For example, in case of a 10-symbol PUCCHof PUCCH format 1, the transmission starts from the 4^(th) symbol of theslot, and, then, the last 14^(th) symbol may not be transmitted for the1-symbol PUCCH format 0. Additionally, even in case of a 14-symbolPUCCH, an operation of not transmitting the 13^(th) or 14^(th) symbolfor the 1-symbol or 2-symbol PUCCH transmission may also be considered.If the number of transmission symbols is reduced, the multiplexingcapacity of the shortened PUCCH format 1 may also be reducedaccordingly.

Since UEs having diverse BW sizes of an initial UL BWP exist, a methodof varying the configuration of the default PUCCH resource set inaccordance with the size of Initial UL BWP may be considered. Forexample, when it is assumed that UE A having an initial UL BWP size of100 RB and UE B having an initial UL BWP size of 50 RB exist, the PRBwithin the PUCCH resource set of UE B may be configured to have a largernumber of PUCCH transmissions to be processed via CDM as compared to theUE of 100 RB, so that the entire PUCCH resource set can be configured tohave the same multiplexing capacity. Alternatively, the samemultiplexing capacity per PRB may be maintained, and UE A may beconfigured by using a larger number of PRBs in its PUCCH resource set.

Meanwhile, the above-described description of the present invention willnot be limited only to a direction communication between UEs and may,therefore, be also used in an uplink or a downlink. At this point, thebase station or a relay node, and so on, may use the methods presentedabove.

Examples of the above-described proposed methods may also be included asone of the implementation methods of the present invention. And,therefore, it is an evident fact that the above-described examples canbe understood as a type of proposed methods. Additionally, although theabove-described proposed methods can be implemented independently, themethod may also be implemented as a combined (or integrated) form ofpart of the proposed methods. For the information on the application ornon-application of the proposed methods (or information on the rules ofthe proposed methods), a rule may be defined so that the information canbe notified through a signal (e.g., a physical layer signal or a higherlayer signal), which is predefined by the base station to the UE or by atransmitting UE to a receiving UE.

FIG. 18 is a block diagram showing components of a transmitting device1810 and a receiving device 1820 for implementing the present invention.Here, the transmitting device and the receiving device may be a basestation and a terminal.

The transmitting device 1810 and the receiving device 1820 mayrespectively include transceivers 1812 and 1822 capable of transmittingor receiving radio frequency (RF) signals carrying information, data,signals and messages, memories 1813 and 1823 for storing various typesof information regarding communication in a wireless communicationsystem, and processors 1811 and 1821 connected to components such as thetransceivers 1812 and 1822 and the memories 1813 and 1823 and configuredto control the memories 1813 and 1823 and/or the transceivers 1812 and1822 such that the corresponding devices perform at least one ofembodiments of the present invention.

The memories 1813 and 1823 can store programs for processing and controlof the processors 1811 and 1821 and temporarily store input/outputinformation. The memories 1813 and 1823 may be used as buffers.

The processors 1811 and 1821 generally control overall operations ofvarious modules in the transmitting device and the receiving device.Particularly, the processors 1811 and 1821 can execute various controlfunctions for implementing the present invention. The processors 1811and 1821 may be referred to as controllers, microcontrollers,microprocessors, microcomputers, etc. The processors 1811 and 1821 canbe realized by hardware, firmware, software or a combination thereof.When the present invention is realized using hardware, the processors1811 and 1821 may include ASICs (application specific integratedcircuits), DSPs (digital signal processors), DSPDs (digital signalprocessing devices), PLDs (programmable logic devices), FPGAs (fieldprogrammable gate arrays) or the like configured to implement thepresent invention. When the present invention is realized using firmwareor software, the firmware or software may be configured to includemodules, procedures or functions for performing functions or operationsof the present invention, and the firmware or software configured toimplement the present invention may be included in the processors 1811and 1821 or stored in the memories 1813 and 1823 and executed by theprocessors 1811 and 1821.

The processor 1811 of the transmitting device 1810 can performpredetermined coding and modulation on a signal and/or data to betransmitted to the outside and then transmit the signal and/or data tothe transceiver 1812. For example, the processor 1811 can performdemultiplexing, channel coding, scrambling and modulation on a datastring to be transmitted to generate a codeword. The codeword caninclude information equivalent to a transport block which is a datablock provided by an MAC layer. One transport block (TB) can be codedinto one codeword. Each codeword can be transmitted to the receivingdevice through one or more layers. The transceiver 1812 may include anoscillator for frequency up-conversion. The transceiver 1812 may includeone or multiple transmission antennas.

The signal processing procedure of the receiving device 1820 may bereverse to the signal processing procedure of the transmitting device1810. The transceiver 1822 of the receiving device 1820 can receive RFsignals transmitted from the transmitting device 1810 under the controlof the processor 1821. The transceiver 1822 may include one or multiplereception antennas. The transceiver 1822 can frequency-down-convertsignals received through the reception antennas to restore basebandsignals. The transceiver 1822 may include an oscillator for frequencydown conversion. The processor 1821 can perform decoding anddemodulation on RF signals received through the reception antennas torestore data that is intended to be transmitted by the transmittingdevice 1810.

The transceivers 1812 and 1822 may include one or multiple antennas. Theantennas can transmit signals processed by the transceivers 1812 and1822 to the outside or receive RF signals from the outside and deliverthe RF signal to the transceivers 1812 and 1822 under the control of theprocessors 1811 and 1821 according to an embodiment of the presentinvention. The antennas may be referred to as antenna ports. Eachantenna may correspond to one physical antenna or may be configured by acombination of a plurality of physical antenna elements. A signaltransmitted from each antenna cannot be decomposed by the receivingdevice 1820. A reference signal (RS) transmitted corresponding to anantenna defines an antenna from the viewpoint of the receiving device1820 and can allow the receiving device 1820 to be able to estimate achannel with respect to the antenna irrespective of whether the channelis a single radio channel from a physical antenna or a composite channelfrom a plurality of physical antenna elements including the antenna.That is, an antenna can be defined such that a channel carrying a symbolon the antenna can be derived from the channel over which another symbolon the same antenna is transmitted. A transceiver which supports amulti-input multi-output (MIMO) function of transmitting and receivingdata using a plurality of antennas may be connected to two or moreantennas.

FIG. 19 illustrates an example of a signal processing module structurein the transmitting device 1810. Here, signal processing can beperformed by a processor of a base station/terminal, such as theprocessors 1811 and 1821 of FIG. 18.

Referring to FIG. 18, the transmitting device 1810 included in aterminal or a base station may include scramblers 301, modulators 302, alayer mapper 303, an antenna port mapper 304, resource block mappers 305and signal generators 306.

The transmitting device 1810 can transmit one or more codewords. Codedbits in each codeword are scrambled by the corresponding scrambler 301and transmitted over a physical channel. A codeword may be referred toas a data string and may be equivalent to a transport block which is adata block provided by the MAC layer.

Scrambled bits are modulated into complex-valued modulation symbols bythe corresponding modulator 302. The modulator 302 can modulate thescrambled bits according to a modulation scheme to arrangecomplex-valued modulation symbols representing positions on a signalconstellation. The modulation scheme is not limited and m-PSK (m-PhaseShift Keying) or m-QAM (m-Quadrature Amplitude Modulation) may be usedto modulate the coded data. The modulator may be referred to as amodulation mapper.

The complex-valued modulation symbols can be mapped to one or moretransport layers by the layer mapper 303. Complex-valued modulationsymbols on each layer can be mapped by the antenna port mapper 304 fortransmission on an antenna port.

Each resource block mapper 305 can map complex-valued modulation symbolswith respect to each antenna port to appropriate resource elements in avirtual resource block allocated for transmission. The resource blockmapper can map the virtual resource block to a physical resource blockaccording to an appropriate mapping scheme. The resource block mapper305 can allocate complex-valued modulation symbols with respect to eachantenna port to appropriate subcarriers and multiplex the complex-valuedmodulation symbols according to a user.

Each signal generator 306 can modulate complex-valued modulation symbolswith respect to each antenna port, that is, antenna-specific symbols,according to a specific modulation scheme, for example, OFDM (OrthogonalFrequency Division Multiplexing), to generate a complex-valued timedomain OFDM symbol signal. The signal generator can perform IFFT(Inverse Fast Fourier Transform) on the antenna-specific symbols, and aCP (cyclic Prefix) can be inserted into time domain symbols on whichIFFT has been performed. OFDM symbols are subjected to digital-analogconversion and frequency up-conversion and then transmitted to thereceiving device through each transmission antenna. The signal generatormay include an IFFT module, a CP inserting unit, a digital-to-analogconverter (DAC) and a frequency upconverter.

FIG. 20 illustrates another example of the signal processing modulestructure in the transmitting device 1810. Here, signal processing canbe performed by a processor of a terminal/base station, such as theprocessors 1811 and 1821 of FIG. 18.

Referring to FIG. 20, the transmitting device 1810 included in aterminal or a base station may include scramblers 401, modulators 402, alayer mapper 403, a precoder 404, resource block mappers 405 and signalgenerators 406.

The transmitting device 1810 can scramble coded bits in a codeword bythe corresponding scrambler 401 and then transmit the scrambled codedbits through a physical channel.

Scrambled bits are modulated into complex-valued modulation symbols bythe corresponding modulator 402. The modulator can modulate thescrambled bits according to a predetermined modulation scheme to arrangecomplex-valued modulation symbols representing positions on a signalconstellation. The modulation scheme is not limited and pi/2-BPSK(pi/2-Binary Phase Shift Keying), m-PSK (m-Phase Shift Keying) or m-QAM(m-Quadrature Amplitude Modulation) may be used to modulate the codeddata.

The complex-valued modulation symbols can be mapped to one or moretransport layers by the layer mapper 403.

Complex-valued modulation symbols on each layer can be precoded by theprecoder 404 for transmission on an antenna port. Here, the precoder mayperform transform precoding on the complex-valued modulation symbols andthen perform precoding. Alternatively, the precoder may performprecoding without performing transform precoding. The precoder 404 canprocess the complex-valued modulation symbols according to MIMO usingmultiple transmission antennas to output antenna-specific symbols anddistribute the antenna-specific symbols to the corresponding resourceblock mapper 405. An output z of the precoder 404 can be obtained bymultiplying an output y of the layer mapper 403 by an N*M precodingmatrix W. Here, N is the number of antenna ports and M is the number oflayers.

Each resource block mapper 405 maps complex-valued modulation symbolswith respect to each antenna port to appropriate resource elements in avirtual resource block allocated for transmission.

The resource block mapper 405 can allocate complex-valued modulationsymbols to appropriate subcarriers and multiplex the complex-valuedmodulation symbols according to a user.

Each signal generator 406 can modulate complex-valued modulation symbolsaccording to a specific modulation scheme, for example, OFDM, togenerate a complex-valued time domain OFDM symbol signal. The signalgenerator 406 can perform IFFT (Inverse Fast Fourier Transform) onantenna-specific symbols, and a CP (cyclic Prefix) can be inserted intotime domain symbols on which IFFT has been performed. OFDM symbols aresubjected to digital-analog conversion and frequency up-conversion andthen transmitted to the receiving device through each transmissionantenna. The signal generator 406 may include an IFFT module, a CPinserting unit, a digital-to-analog converter (DAC) and a frequencyupconverter.

The signal processing procedure of the receiving device 1820 may bereverse to the signal processing procedure of the transmitting device.Specifically, the processor 1821 of the transmitting device 1810 decodesand demodulates RF signals received through antenna ports of thetransceiver 1822. The receiving device 1820 may include a plurality ofreception antennas, and signals received through the reception antennasare restored to baseband signals, and then multiplexed and demodulatedaccording to MIMO to be restored to a data string intended to betransmitted by the transmitting device 1810. The receiving device 1820may include a signal restoration unit for restoring received signals tobaseband signals, a multiplexer for combining and multiplexing receivedsignals, and a channel demodulator for demodulating multiplexed signalstrings into corresponding codewords. The signal restoration unit, themultiplexer and the channel demodulator may be configured as anintegrated module or independent modules for executing functionsthereof. More specifically, the signal restoration unit may include ananalog-to-digital converter (ADC) for converting an analog signal into adigital signal, a CP removal unit for removing a CP from the digitalsignal, an FET module for applying FFT (fast Fourier transform) to thesignal from which the CP has been removed to output frequency domainsymbols, and a resource element demapper/equalizer for restoring thefrequency domain symbols to antenna-specific symbols. Theantenna-specific symbols are restored to transport layers by themultiplexer and the transport layers are restored by the channeldemodulator to codewords intended to be transmitted by the transmittingdevice.

FIG. 21 illustrates an example of a wireless communication deviceaccording to an implementation example of the present invention.

Referring to FIG. 21, the wireless communication device, for example, aterminal may include at least one of a processor 2310 such as a digitalsignal processor (DSP) or a microprocessor, a transceiver 2335, a powermanagement module 2305, an antenna 2340, a battery 2355, a display 2315,a keypad 2320, a global positioning system (GPS) chip 2360, a sensor2365, a memory 2330, a subscriber identification module (SIM) card 2325,a speaker 2345 and a microphone 2350. A plurality of antennas and aplurality of processors may be provided.

The processor 2310 can implement functions, procedures and methodsdescribed in the present description. The processor 2310 in FIG. 21 maybe the processors 1811 and 1821 in FIG. 18.

The memory 2330 is connected to the processor 2310 and storesinformation related to operations of the processor. The memory may belocated inside or outside the processor and connected to the processorthrough various techniques such as wired connection and wirelessconnection. The memory 2330 in FIG. 21 may be the memories 1813 and 1823in FIG. 18.

A user can input various types of information such as telephone numbersusing various techniques such as pressing buttons of the keypad 2320 oractivating sound using the microphone 2350. The processor 2310 canreceive and process user information and execute an appropriate functionsuch as calling using an input telephone number. In some scenarios, datacan be retrieved from the SIM card 2325 or the memory 2330 to executeappropriate functions. In some scenarios, the processor 2310 can displayvarious types of information and data on the display 2315 for userconvenience.

The transceiver 2335 is connected to the processor 2310 and transmitand/or receive RF signals. The processor can control the transceiver inorder to start communication or to transmit RF signals including varioustypes of information or data such as voice communication data. Thetransceiver includes a transmitter and a receiver for transmitting andreceiving RF signals. The antenna 2340 can facilitate transmission andreception of RF signals. In some implementation examples, when thetransceiver receives an RF signal, the transceiver can forward andconvert the signal into a baseband frequency for processing performed bythe processor. The signal can be processed through various techniquessuch as converting into audible or readable information to be outputthrough the speaker 2345. The transceiver in FIG. 21 may be thetransceivers 1812 and 1822 in FIG. 18.

Although not shown in FIG. 21, various components such as a camera and auniversal serial bus (USB) port may be additionally included in theterminal. For example, the camera may be connected to the processor2310.

FIG. 21 is an example of implementation with respect to the terminal andimplementation examples of the present invention are not limitedthereto. The terminal need not essentially include all the componentsshown in FIG. 21. That is, some of the components, for example, thekeypad 2320, the GPS chip 2360, the sensor 2365 and the SIM card 2325may not be essential components. In this case, they may not be includedin the terminal.

1-15. (canceled)
 16. A method for receiving hybrid automatic repeatrequest-acknowledgement (HARQ-ACK) information in a wirelesscommunication system, the method performed by a base station (BS) andcomprising: transmitting system information to a user equipment (UE),wherein the system information informs the UE of a physical uplinkcontrol channel (PUCCH) resource set among a plurality of PUCCH resourcesets, wherein each of the plurality of PUCCH resource sets ispre-defined, and receiving, from the UE, the HARQ-ACK information on aPUCCH based on a PUCCH resource in the PUCCH resource set, wherein eachof the plurality of PUCCH resource sets informs the UE of a combinationof a starting symbol, a number of symbols and a PUCCH format of thePUCCH resource set, wherein the PUCCH format of each of the plurality ofPUCCH resource sets is either PUCCH format 0 or PUCCH format
 1. 17. Themethod of claim 16, wherein a number of the pre-defined plurality ofPUCCH resource sets is
 16. 18. The method of claim 16, wherein each ofthe plurality of PUCCH resource sets is related to the PUCCH format anda combination of the starting symbol and the number of symbols.
 19. Themethod of claim 16, wherein a number of symbols of the pre-definedplurality of PUCCH resource sets includes 2, 10, and
 14. 20. The methodof claim 16, wherein the UE is not configured a dedicated PUCCHresource.
 21. The method of claim 16, wherein the PUCCH format 0 is usedfor up to 2-bit payload size and for 1 or 2 symbols configuring thePUCCH, and wherein the PUCCH format 1 is used for up to 2-bit payloadsize and for 4 to 14 symbols configuring the PUCCH.
 22. A base station(BS) comprising: a transceiver configured to transmit and receive aradio signal; and a processor coupled to the transceiver, wherein theprocessor is configured to: transmit system information to a userequipment (UE), wherein the system information informs the UE of aphysical uplink control channel (PUCCH) resource set among a pluralityof PUCCH resource sets, wherein each of the plurality of PUCCH resourcesets is pre-defined, and receive, from the UE, the HARQ-ACK informationon a PUCCH based on a PUCCH resource in the PUCCH resource set, whereineach of the plurality of PUCCH resource sets informs the UE of acombination of a starting symbol, a number of symbols and a PUCCH formatof the PUCCH resource set, wherein the PUCCH format of each of theplurality of PUCCH resource sets is either PUCCH format 0 or PUCCHformat
 1. 23. The BS of claim 22, wherein a number of the pre-definedplurality of PUCCH resource sets is
 16. 24. The BS of claim 22, whereineach of the plurality of PUCCH resource sets is related to the PUCCHformat and a combination of the starting symbol and the number ofsymbols.
 25. The BS of claim 22, wherein a number of symbols of thepre-defined plurality of PUCCH resource sets includes 2, 10, and
 14. 26.The BS of claim 22, wherein the UE is not configured a dedicated PUCCHresource.
 27. The BS of claim 22, wherein the PUCCH format 0 is used forup to 2-bit payload size and for 1 or 2 symbols configuring the PUCCH,and wherein the PUCCH format 1 is used for up to 2-bit payload size andfor 4 to 14 symbols configuring the PUCCH.
 28. An apparatus in wirelesscommunication system, the apparatus comprising: a processor; and amemory coupled to the processor, wherein the processor is configured to:receive system information from a base station, wherein the systeminformation informs the UE of a physical uplink control channel (PUCCH)resource set among a plurality of PUCCH resource sets, wherein each ofthe plurality of PUCCH resource sets is pre-defined, and perform theHARQ-ACK transmission on a PUCCH based on a PUCCH resource in the PUCCHresource set, wherein each of the plurality of PUCCH resource setsinforms the UE of a combination of a starting symbol, a number ofsymbols and a PUCCH format of the PUCCH resource set, wherein the PUCCHformat of each of the plurality of PUCCH resource sets is either PUCCHformat 0 or PUCCH format 1.